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具体使用</p> <ol><li><code>activated</code>路由组件被激活时触发</li> <li><code>deactivated</code>路由组件失活时触发</li></ol> <p><img src="https://hasakwebblogimg.oss-cn-hangzhou.aliyuncs.com/202303181653725.gif" alt="手风琴动画.gif"></p> <p><code>src/pages/News.vue</code></p> <div class="language-vue line-numbers-mode"><pre class="language-vue"><code><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>ul</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span> <span class="token attr-name">:style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>{opacity}<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>欢迎学习vue<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>news001 <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>news002 <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>news003 <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>ul</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'News'</span><span class="token punctuation">,</span>
        <span class="token function">data</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span><span class="token punctuation">{</span>
                <span class="token literal-property property">opacity</span><span class="token operator">:</span><span class="token number">1</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token function">activated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'News组件被激活了'</span><span class="token punctuation">)</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>timer <span class="token operator">=</span> <span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
                <span class="token keyword">this</span><span class="token punctuation">.</span>opacity <span class="token operator">-=</span> <span class="token number">0.01</span>
                <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>opacity <span class="token operator">&lt;=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token keyword">this</span><span class="token punctuation">.</span>opacity <span class="token operator">=</span> <span class="token number">1</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">16</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token function">deactivated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'News组件失活了'</span><span class="token punctuation">)</span>
            <span class="token function">clearInterval</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>timer<span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br></div></div><h3 id="_6-13-路由守卫"><a href="#_6-13-路由守卫" class="header-anchor">#</a> 6.13. 路由守卫</h3> <p>作用：对路由进行权限控制
分类：全局守卫、独享守卫、组件内守卫</p> <ol><li>全局守卫
<code>meta</code>路由源信息</li></ol> <div class="language-vue line-numbers-mode"><pre class="language-vue"><code>
// 全局前置守卫：初始化时、每次路由切换前执行
router.beforeEach((to,from,next) =&gt; {
	console.log('beforeEach',to,from)
	if(to.meta.isAuth){ // 判断当前路由是否需要进行权限控制
		if(localStorage.getItem('school') === 'atguigu'){ // 权限控制的具体规则
			next()	// 放行
		}else{
			alert('暂无权限查看')
		}
	}else{
		next()	// 放行
	}
})

// 全局后置守卫：初始化时、每次路由切换后执行
router.afterEach((to,from) =&gt; {
	console.log('afterEach',to,from)
	if(to.meta.title){ 
		document.title = to.meta.title //修改网页的title
	}else{
		document.title = 'vue_test'
	}
})
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><ol start="2"><li><strong>独享守卫</strong></li></ol> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token function">beforeEnter</span><span class="token punctuation">(</span><span class="token parameter">to<span class="token punctuation">,</span>from<span class="token punctuation">,</span>next</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'beforeEnter'</span><span class="token punctuation">,</span>to<span class="token punctuation">,</span>from<span class="token punctuation">)</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>localStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span><span class="token string">'school'</span><span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token string">'atguigu'</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
        <span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">'暂无权限查看'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><ol start="3"><li><strong>组件内守卫</strong></li></ol> <div class="language-vue line-numbers-mode"><pre class="language-vue"><code>//进入守卫：通过路由规则，进入该组件时被调用
beforeRouteEnter (to, from, next) {... next()},

//离开守卫：通过路由规则，离开该组件时被调用
beforeRouteLeave (to, from, next) {... next()},
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h3 id="_6-13-1-全局路由守卫"><a href="#_6-13-1-全局路由守卫" class="header-anchor">#</a> 6.13.1. 全局路由守卫</h3> <p><code>src/router/index.js</code></p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token comment">//该文件专门用于创建整个应用的路由器</span>
<span class="token comment">//引入组件</span>
<span class="token keyword">import</span> Home <span class="token keyword">from</span> <span class="token string">'../pages/Home'</span>
<span class="token keyword">import</span> About <span class="token keyword">from</span> <span class="token string">'../pages/About'</span>
<span class="token keyword">import</span> News <span class="token keyword">from</span> <span class="token string">'../pages/News'</span>
<span class="token keyword">import</span> Message <span class="token keyword">from</span> <span class="token string">'../pages/Message'</span>
<span class="token keyword">import</span> Detail <span class="token keyword">from</span> <span class="token string">'../pages/Detail'</span>


<span class="token comment">//创建一个路由器</span>
<span class="token keyword">const</span> router <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">VueRouter</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
    <span class="token literal-property property">routes</span><span class="token operator">:</span><span class="token punctuation">[</span>
        <span class="token punctuation">{</span>
            <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'guanyv'</span><span class="token punctuation">,</span>
            <span class="token literal-property property">path</span><span class="token operator">:</span><span class="token string">'/about'</span><span class="token punctuation">,</span>
            <span class="token literal-property property">component</span><span class="token operator">:</span>About<span class="token punctuation">,</span>
            <span class="token literal-property property">meta</span><span class="token operator">:</span><span class="token punctuation">{</span><span class="token literal-property property">title</span><span class="token operator">:</span><span class="token string">'关于'</span><span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token punctuation">{</span>
            <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'zhuye'</span><span class="token punctuation">,</span>
            <span class="token literal-property property">path</span><span class="token operator">:</span><span class="token string">'/home'</span><span class="token punctuation">,</span>
            <span class="token literal-property property">component</span><span class="token operator">:</span>Home<span class="token punctuation">,</span>
            <span class="token literal-property property">meta</span><span class="token operator">:</span><span class="token punctuation">{</span><span class="token literal-property property">title</span><span class="token operator">:</span><span class="token string">'主页'</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
            <span class="token literal-property property">children</span><span class="token operator">:</span><span class="token punctuation">[</span>
                <span class="token punctuation">{</span>
                    <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'xinwen'</span><span class="token punctuation">,</span>
                    <span class="token literal-property property">path</span><span class="token operator">:</span><span class="token string">'news'</span><span class="token punctuation">,</span>
                    <span class="token literal-property property">component</span><span class="token operator">:</span>News<span class="token punctuation">,</span>
                    <span class="token literal-property property">meta</span><span class="token operator">:</span><span class="token punctuation">{</span><span class="token literal-property property">isAuth</span><span class="token operator">:</span><span class="token boolean">true</span><span class="token punctuation">,</span><span class="token literal-property property">title</span><span class="token operator">:</span><span class="token string">'新闻'</span><span class="token punctuation">}</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span>
                <span class="token punctuation">{</span>
                    <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'xiaoxi'</span><span class="token punctuation">,</span>
                    <span class="token literal-property property">path</span><span class="token operator">:</span><span class="token string">'message'</span><span class="token punctuation">,</span>
                    <span class="token literal-property property">component</span><span class="token operator">:</span>Message<span class="token punctuation">,</span>
                    <span class="token literal-property property">meta</span><span class="token operator">:</span><span class="token punctuation">{</span><span class="token literal-property property">isAuth</span><span class="token operator">:</span><span class="token boolean">true</span><span class="token punctuation">,</span><span class="token literal-property property">title</span><span class="token operator">:</span><span class="token string">'消息'</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
                    <span class="token literal-property property">children</span><span class="token operator">:</span><span class="token punctuation">[</span>
                        <span class="token punctuation">{</span>
                            <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'xiangqing'</span><span class="token punctuation">,</span>
                            <span class="token literal-property property">path</span><span class="token operator">:</span><span class="token string">'detail'</span><span class="token punctuation">,</span>
                            <span class="token literal-property property">component</span><span class="token operator">:</span>Detail<span class="token punctuation">,</span>
                            <span class="token literal-property property">meta</span><span class="token operator">:</span><span class="token punctuation">{</span><span class="token literal-property property">isAuth</span><span class="token operator">:</span><span class="token boolean">true</span><span class="token punctuation">,</span><span class="token literal-property property">title</span><span class="token operator">:</span><span class="token string">'详情'</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
                            <span class="token function">props</span><span class="token punctuation">(</span><span class="token parameter">$route</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                                <span class="token keyword">return</span> <span class="token punctuation">{</span>
                                    <span class="token literal-property property">id</span><span class="token operator">:</span>$route<span class="token punctuation">.</span>query<span class="token punctuation">.</span>id<span class="token punctuation">,</span>
                                    <span class="token literal-property property">title</span><span class="token operator">:</span>$route<span class="token punctuation">.</span>query<span class="token punctuation">.</span>title<span class="token punctuation">,</span>
                                <span class="token punctuation">}</span>
														<span class="token punctuation">}</span>
                        <span class="token punctuation">}</span>
                    <span class="token punctuation">]</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">]</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment">// 🔴全局前置路由守卫————初始化的时候、每次路由切换之前被调用</span>
router<span class="token punctuation">.</span><span class="token function">beforeEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">to<span class="token punctuation">,</span>from<span class="token punctuation">,</span>next</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'前置路由守卫'</span><span class="token punctuation">,</span>to<span class="token punctuation">,</span>from<span class="token punctuation">)</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span>to<span class="token punctuation">.</span>meta<span class="token punctuation">.</span>isAuth<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>localStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span><span class="token string">'school'</span><span class="token punctuation">)</span><span class="token operator">===</span><span class="token string">'atguigu'</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
            <span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">'学校名不对，无权限查看！'</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
        <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment">// 🔴全局后置路由守卫————初始化的时候被调用、每次路由切换之后被调用</span>
router<span class="token punctuation">.</span><span class="token function">afterEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">to<span class="token punctuation">,</span><span class="token keyword">from</span></span><span class="token punctuation">)</span><span class="token operator">=&gt;</span><span class="token punctuation">{</span>
	console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'后置路由守卫'</span><span class="token punctuation">,</span>to<span class="token punctuation">,</span>from<span class="token punctuation">)</span>
	document<span class="token punctuation">.</span>title <span class="token operator">=</span> to<span class="token punctuation">.</span>meta<span class="token punctuation">.</span>title <span class="token operator">||</span> <span class="token string">'硅谷系统'</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token comment">// 导出路由器</span>
<span class="token keyword">export</span> <span class="token keyword">default</span> router
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br></div></div><h3 id="_6-13-2-独享路由守卫"><a href="#_6-13-2-独享路由守卫" class="header-anchor">#</a> 6.13.2. 独享路由守卫</h3> <p><code>src/router/index.js</code></p> <div class="language-vue line-numbers-mode"><pre class="language-vue"><code>//该文件专门用于创建整个应用的路由器
import VueRouter from &quot;vue-router&quot;;
//引入组件
import Home from '../pages/Home'
import About from '../pages/About'
import News from '../pages/News'
import Message from '../pages/Message'
import Detail from '../pages/Detail'


//创建一个路由器
const router = new VueRouter({
    routes:[
        {
            name:'guanyv',
            path:'/about',
            component:About,
            meta:{title:'关于'}
        },
        {
            name:'zhuye',
            path:'/home',
            component:Home,
            meta:{title:'主页'},
            children:[
                {
                    name:'xinwen',
                    path:'news',
                    component:News,
                    meta:{title:'新闻'},
                    // 🔴独享守卫，特定路由切换之后被调用
                    beforeEnter(to,from,next){
                        console.log('独享路由守卫',to,from)
                        if(localStorage.getItem('school') === 'atguigu'){
                            next()
                        }else{
                            alert('暂无权限查看')
                        }
                    }
                },
                {
                    name:'xiaoxi',
                    path:'message',
                    component:Message,
                    meta:{title:'消息'},
                    children:[
                        {
                            name:'xiangqing',
                            path:'detail',
                            component:Detail,
                            meta:{title:'详情'},
                            props($route){
                                return {
                                    id:$route.query.id,
                                    title:$route.query.title,
                                }
                            }
                        }
                    ]
                }
            ]
        }
    ]
})

//全局后置路由守卫————初始化的时候被调用、每次路由切换之后被调用
router.afterEach((to,from)=&gt;{
	console.log('后置路由守卫',to,from)
	document.title = to.meta.title || '硅谷系统'
})

//导出路由器
export default router
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br></div></div><h3 id="_6-13-3-组件内路由守卫"><a href="#_6-13-3-组件内路由守卫" class="header-anchor">#</a> 6.13.3. 组件内路由守卫</h3> <p><code>src/pages/About.vue</code></p> <div class="language-vue line-numbers-mode"><pre class="language-vue"><code>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>template</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h2</span><span class="token punctuation">&gt;</span></span>我是About组件的内容<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h2</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>template</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
    <span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token punctuation">{</span>
        <span class="token literal-property property">name</span><span class="token operator">:</span><span class="token string">'About'</span><span class="token punctuation">,</span>
        <span class="token comment">// 通过路由规则，离开该组件时被调用</span>
        <span class="token function">beforeRouteEnter</span> <span class="token punctuation">(</span><span class="token parameter">to<span class="token punctuation">,</span> from<span class="token punctuation">,</span> next</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'About--beforeRouteEnter'</span><span class="token punctuation">,</span>to<span class="token punctuation">,</span>from<span class="token punctuation">)</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>localStorage<span class="token punctuation">.</span><span class="token function">getItem</span><span class="token punctuation">(</span><span class="token string">'school'</span><span class="token punctuation">)</span><span class="token operator">===</span><span class="token string">'atguigu'</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
            <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
                <span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">'学校名不对，无权限查看！'</span><span class="token punctuation">)</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        <span class="token comment">// 通过路由规则，离开该组件时被调用</span>
        <span class="token function">beforeRouteLeave</span> <span class="token punctuation">(</span><span class="token parameter">to<span class="token punctuation">,</span> from<span class="token punctuation">,</span> next</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'About--beforeRouteLeave'</span><span class="token punctuation">,</span>to<span class="token punctuation">,</span>from<span class="token punctuation">)</span>
            <span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br></div></div><h2 id="_6-14-路由器的两种工作模式"><a href="#_6-14-路由器的两种工作模式" class="header-anchor">#</a> 6.14. 路由器的两种工作模式</h2> <ol><li><p>对于一个<code>url</code>来说，什么是<code>hash</code>值？</p> <p><code>#</code><strong>及其后面的内容就是</strong><code>hash值</code></p></li> <li><p><code>hash值</code>不会包含在<code>HTTP</code>请求中，即：<code>hash值</code>不会带给服务器</p></li> <li><p><code>hash</code>模式</p> <ul><li>地址中永远带着#号，不美观</li> <li>若以后将地址通过第三方手机app分享，若app校验严格，则地址会被标记为不合法</li> <li>兼容性较好</li></ul></li> <li><p><code>history</code>模式</p> <ul><li>地址干净，美观</li> <li>兼容性和<code>hash</code>模式相比略差</li> <li>应用部署上线时需要后端人员支持，解决刷新页面服务端404的问题</li></ul></li></ol> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code>
<span class="token keyword">const</span> router <span class="token operator">=</span>  <span class="token keyword">new</span> <span class="token class-name">VueRouter</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
	<span class="token literal-property property">mode</span><span class="token operator">:</span><span class="token string">'history'</span><span class="token punctuation">,</span>
	<span class="token literal-property property">routes</span><span class="token operator">:</span><span class="token punctuation">[</span><span class="token operator">...</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token keyword">export</span> <span class="token keyword">default</span> router
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